Spring -如何在自定义Validator类中使用控制器的@RequestParam参数？

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.springframework.validation.Errors;
import org.springframework.validation.ValidationUtils;
import org.springframework.validation.Validator;

@Component
public class CustomValidator implements Validator {

    @Autowired
    private MyController myController;

    @Override
    public boolean supports(Class<?> clazz) {
        return MyModel.class.equals(clazz);
    }

    @Override
    public void validate(Object target, Errors errors) {
        MyModel myModel = (MyModel) target;
        String param = myController.getParam();

        // 使用@RequestParam参数进行校验
        if (param == null || param.isEmpty()) {
            errors.rejectValue("param", "param.empty", "Param不能为空");
        }

        // 使用Spring提供的校验注解对@RequestParam参数进行校验
        ValidationUtils.rejectIfEmptyOrWhitespace(errors, "param", "param.empty", "Param不能为空");
    }
}